‘IN PLAIN SIGHT’Marshal Mary Shannon (Mary McCormack) hangs up her badge as the drama series comes to an end after five seasons at 10 p.m. on USA. With Frederick Weller as Marshall Mann.

SERIES

Who Do You Think You Are? Rashida Jones learns about her family history on her mother’s side, in this new episode (8 p.m. NBC).Shark Tank: The sharks hear pitches from the inventor of Rollerblades, who has created an innovative monorail bike system and a woman with a line of accessories that can turn any shoes into boots (8 p.m. ABC).Supernatural: Castiel (Misha Collins) awakens from his coma, and Meg (Rachel Miner) contacts Sam and Dean (Jared Padalecki, Jensen Ackles) in this new episode (9 p.m. KTLA).Fringe: Walter (John Noble) is forced to revisit his painful past when a fringe event causes people to spontaneously combust in the opener of the two-part season finale, which concludes next Friday (9 p.m. Fox).Finding Your Roots With Henry Louis Gates, Jr.: Samuel L. Jackson, Condoleezza Rice and Ruth Simmons trace their African ancestors in this new episode (9 p.m. KOCE).Blue Bloods: In this new episode Danny and Jackie (Donnie Wahlberg, Jennifer Esposito) investigate the death of a high-rolling investor who was supposedly in a fight but has no marks on his hands. With Tom Selleck, Will Estes and guest star Frank Whaley (10 p.m. CBS).Goldfathers: This new series focuses on the search for gold in Alaska (10 p.m. National Geographic).

SPECIALS

The Comedy Awards Playlist: This new special features performances by nominees from this year’s Comedy Awards, including Donald Glover, Daniel Tosh and Louis C.K. (9 p.m. Comedy Central).